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The new gateway/use-case code left surviving mutants (empty NoCoverage on the ACL gateway status-set, plus unasserted error messages, null-guards, and the persist call). Add stub-handler tests for SetZaakToEindstatusAsync (eindstatus resolution, POST framing, failure paths) and assert the approve use case's messages, null handling and SaveAsync. Local Stryker: acl 100%, domain 98.4%, event-subscriber 100%. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>